Self-priming height test bed for self-priming pump with high priming travel

Abstract

The invention relates to a self-priming height test bed for a self-priming pump with a high priming travel. The test bed comprises a test pump 1, an adjustable variable-frequency pressurization pump 5 and an electric fixed-difference depressurization valve 9. According to the test bed, the height of the conventional lifting table is used; in order to simulate a state of an actual self-priming height, the adjustable variable-frequency pressurization pump 5 is added on a water-returning pipe of the pump to compensate a pressing head at an inlet of a sprayer of a jet flow device, and the electric fixed-difference depressurization valve 9 is added to increase pressure drop of the inlet of the pump; an inlet of the adjustable variable-frequency pressurization pump 5 is connected with an outlet of the water-returning pipe 4 of the pump, and an outlet of the adjustable variable-frequency pressurization pump 5 is connected with an inlet of the sprayer of the jet flow device 7; and an inlet of the electric fixed-difference depressurization valve 9 is connected with the upper end of a Venturi pipe of the jet flow device 7, and an outlet of the electric fixed-difference depressurization valve 9 is connected with an inlet of the test pump 1. According to a mounting height to be simulated, a lift of the adjustable variable-frequency pressurization pump 5 and a to-be-reduced pressure difference between the inlet and the outlet of the electric fixed-difference depressurization valve 9 are determined and are set. The self-priming height test bed has the characteristics that the actual mounting height of the test bed is not changed and a demand for testing various spraying pumps can be met.

Description

technical field [0001] The invention relates to a self-priming height test bench for a self-priming pump with a high suction stroke. Background technique [0002] The self-priming pump is a special kind of centrifugal pump, which means that it only needs to add a certain amount of water to the pump before starting for the first time, without filling the water inlet pipe with water. A type of water pump that enters the normal working state immediately after the gas is discharged. In addition to the hydraulic performance parameters of ordinary centrifugal pumps, such as flow, head, efficiency and other parameters, self-priming height and self-priming time are unique performance parameters of self-priming pumps, and are important indicators for evaluating self-priming performance of self-priming pumps. The self-priming height refers to the installation height from the liquid level to the center line of the pump inlet flange when the self-priming pump pumps up the liquid. In g...

AI Technical Summary

Problems solved by technology

If you want to test a jet pump with a high self-priming height, you need to install it in a very high place or on a lifting tower, that is, you need a high installation height, which will inevitably require a lot of investment

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